Globally, according to research by the Rocky Mountain Institute, EVs will comprise two-thirds of the world’s car sales by 2030. However, according to the World Resources Institute, “EVs need to account for 75 percent to 95 percent of passenger vehicle sales by 2030 in order to meet international climate goals aimed at keeping global warming to 1.5 degrees C (2.7 degrees F).”
There are electric 18 wheeler trucks about to be available in about a year. It is estimated that the truck would be paid off in 2 years by fuel savings alone.
Replacing diesel trucks will probably bridge the gap
Replacing long haul with rail and personal vehicles with public transportation will vastly lower the adoption
It really depends on where and when you’re charging.
Electricity isn’t free. I have a PHEV and for me in my area gas becomes cheaper after about $1.80/gal (IIRC). Electricity is more expensive to go per mile if I charge during peak times (for us that’s 4p-8p) when the price jump 3x, from 11¢/kWh to 33¢kWh. So the vehicle is scheduled to not charge during that time.
Diesel will offset that some since it’s more expensive than gas is and has been for years now. No one is going to pay a truck off in 2 years from savings. It’ll be faster, almost certainly. However, saying 2 years can’t be looking at the whole picture.